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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2010-2014 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
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 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */
package org.glassfish.jersey.message.internal;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

import javax.ws.rs.Consumes;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;

import javax.inject.Singleton;

import org.glassfish.jersey.message.MessageUtils;

/**
 *
 * @author Paul Sandoz
 */
@Produces({"text/plain", "*/*"})
@Consumes({"text/plain", "*/*"})
@Singleton
public final class ReaderProvider extends AbstractMessageReaderWriterProvider {

    @Override
    public boolean isReadable(final Class type, final Type genericType, final Annotation[] annotations,
                              final MediaType mediaType) {
        return Reader.class == type;
    }

    @Override
    public Reader readFrom(
            final Class type,
            final Type genericType,
            final Annotation[] annotations,
            final MediaType mediaType,
            final MultivaluedMap httpHeaders,
            final InputStream inputStream) throws IOException {

        final EntityInputStream entityStream = EntityInputStream.create(inputStream);
        if (entityStream.isEmpty()) {
            return new BufferedReader(new InputStreamReader(
                    new ByteArrayInputStream(new byte[0]), MessageUtils.getCharset(mediaType)));
        }

        return new BufferedReader(new InputStreamReader(entityStream, getCharset(mediaType)));
    }

    @Override
    public boolean isWriteable(final Class type, final Type genericType, final Annotation[] annotations,
                               final MediaType mediaType) {
        return Reader.class.isAssignableFrom(type);
    }

    @Override
    public void writeTo(
            final Reader t,
            final Class type,
            final Type genericType,
            final Annotation[] annotations,
            final MediaType mediaType,
            final MultivaluedMap httpHeaders,
            final OutputStream entityStream) throws IOException {
        try {
            final OutputStreamWriter out = new OutputStreamWriter(entityStream,
                    getCharset(mediaType));
            writeTo(t, out);
            out.flush();
        } finally {
            t.close();
        }

    }
}